#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

size_t Mystrlen(char* c)
{
	int ret = 0;
	while (*c++)
	{
		ret++;
	}
	return ret;
}


int main()
{

	char a [] = "1234567";
	printf("%zd\n", Mystrlen(a));
	return 0;
}